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Sacsayhuamán

Sacsayhuamán is an Incan ruin within the city limits of modern Cusco. Sacsayhuamán's most striking feature is its walls – some of them up to 400m long and six metres tall, which some archaeologists think were used as fortification and some think is supposed to be looked at from above where it forms a shape – a puma's head. Whatever the reason for their placement their very construction is impressive, and some of the largest blocks probably weigh more than 100 tonnes each – you can't even fit a piece of paper between the stone blocks they're so perfectly fitted together. The construction is also the reason the walls have survived so well.

These days the flushed green fields between the walls are used by joggers, athletics and people practising tai chi.